作者:Devon A. Mundal、Kelly E. Lutz、Regan J. Thomson
DOI:10.1021/ja301489n
日期:2012.4.4
A one-pot synthesis of allenes by the 2-nitrobenzenesulfonylhydrazide-mediated coupling of hydroxyaldehydes or ketones with alkynyl trifluoroborate salts is reported. This mild process involves in situ formation of a sulfonylhydrazone that reacts with alkynyl trifluoroborates to generate a transient propargylic hydrazide species. Decomposition of this unstable hydrazide via an intermediate monoalkyldiazine
报道了通过羟基醛或酮与炔基三氟硼酸盐的 2-硝基苯磺酰肼介导的偶联来一锅法合成丙二烯。这种温和的过程涉及原位形成磺酰腙,该磺酰腙与炔基三氟硼酸盐反应生成瞬态炔丙基酰肼物质。这种不稳定的酰肼通过中间体单烷基二嗪分解,通过烯烃步行机制产生丙二烯产物。